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Finding the Fourth Proportional to 672.40, 1,008.60 and 239.40

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Solution

The fourth proportional to 672.40, 1,008.60 and 239.40 is: 359.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.40 : 1,008.60 = 239.40 : x
  2. Step 2: Convert to fraction form
    672.40/1,008.60 = 239.40/x
  3. Step 3: Cross multiply
    672.40x = 1,008.60 × 239.40
  4. Step 4: Simplify right side
    672.40x = 241,458.84
  5. Step 5: Solve for x
    x = 241,458.84/672.40
  6. Step 6: Final answer
    x = 359.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.